If a robber steals one grain of rice from each person in a town, was anyone harmed? If you think not, then what if a thousand robbers do the same?

Leeching off of companies is kind of like stealing a grain of rice from everyone. The company's costs increase and the price eventually makes its way back to the consumer.

Another way to think about it is the total amount of labor needed for the world to operate as it does. In a world that has no ransomware, the labor needed is X. In a world with ransomware it is X + cost of building ransomware + cost of dealing with ransomware.